A person invested $8,800 in an account growing at a rate allowing the money to double every 15 years. How much money would be in the account after 4 years, to the
nearest dollar?

Me! i really need to get this right before 9. prove the divisibility of 7^6+7^5-7^4 by 11. use factoring so you get a number times 11. just tell me the number. i need this done asap